What is the vertex of a function

Parabolas always have a lowest point (or a highest point, if the parabola is upside-down). This point, where the parabola changes direction, is called the "vertex". If the quadratic is written in the form y = a(x – h)2 + k, then the vertex is the point (h, k)

Step-by-step explanation:

This means that the vertex if going to be where the function goes it's higher and it lower